21047240

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{7411}}^1$

素因数の和:7493

約数の個数: 32

約数和(自身を含む): 48029760

約数和(自身を除く): 26982520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 7411, 14822, 29644, 37055, 59288, 74110, 148220, 296440, 526181, 1052362, 2104724, 2630905, 4209448, 5261810, 10523620, 21047240]

約数ペア:

[(1, 21047240), (2, 10523620), (4, 5261810), (5, 4209448), (8, 2630905), (10, 2104724), (20, 1052362), (40, 526181), (71, 296440), (142, 148220), (284, 74110), (355, 59288), (568, 37055), (710, 29644), (1420, 14822), (2840, 7411)]